Silicon doped with gallium forms

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(D) Silicon belongs to group $14$ and gallium belongs to group $13$. When $Si$ is doped with $Ga$,a $p$-type semiconductor is produced. This is becaus

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$p$-type semiconductor

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(D) Silicon belongs to group $14$ and gallium belongs to group $13$. When $Si$ is doped with $Ga$,a $p$-type semiconductor is produced. This is because group $13$ elements have only $3$ valence electrons,while group $14$ elements have $4$. This creates an electron-deficient bond or an electron vacancy (hole) in the crystal lattice. These holes can move through the crystal like a positive charge,giving rise to electrical conductivity.

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